Re the GI for meals:-

If its a Montignac official book, and he specifies whether they are Phase 1 or Phase 2 - its a good bet that Phase 1 will be a total GI of around 30, and Pahs 2 GI of around 50.

Assuming he sticks to his own definitions of GI levels for Phase 1 and Phase 2!

As for copyright. As long as you are not making money off his recipes, you should be fine if you credit the author or owner of the copyright.

Spang